p-Block (13–14)

8 JEE Main questions · Chemistry

ChemistryJEE Main 21 Jan 2026, Shift 1·Q5·MCQ·Easy–moderate
Open
Acidic and amphoteric oxides
Given below are two statements :
Statement I : The number of pairs among [ $\ce{SiO2}$ , $\ce{CO2}$ ], [ $\ce{SnO}$ , $\ce{SnO2}$ ], [ $\ce{PbO}$ , $\ce{PbO2}$ ] and [ $\ce{GeO}$ , $\ce{GeO2}$ ], which contain oxides that are both amphoteric is 2.
Statement II : $\ce{BF3}$ is an electron deficient molecule that can act as a lewis acid, forms adduct with $\ce{NH3}$ and has a trigonal planar geometry.
In the light of the above statement, choose the correct answer from the option given below.
1. (1)Both Statement I and Statement II are true.
2. (2)Both Statement I and Statement II are false.
3. (3)Statement I is true but Statement II is false.
4. (4)Statement I is false but Statement II is true.
We corrected a printing error in the original paper
Source printed “an electron deficient molecule can act as a lewis acid” and, in option (4), “Statement I is false Statement II is true”.
ChemistryJEE Main 23 Jan 2026, Shift 1·Q19·MCQ·Easy–moderate
Open
Group 13 periodic trends
The correct statements from the following are :
- (A)Ionic radii of trivalent cations of group 13 elements decrease down the group.
- (B)Electronegativity of group 13 elements decreases down the group.
- (C)Among the group 13 elements, Boron has highest first ionisation enthalpy.
- (D)The trichloride and triiodide of group 13 elements are covalent in nature.
Choose the correct answer from the options given below :
1. (1)A and C only
2. (2)A and D only
3. (3)C and D only
4. (4)B and D only
We corrected a printing error in the original paper
Source printed “Ionic radii … decreases down the group” and “from the otpions given below”.
ChemistryJEE Main 23 Jan 2026, Shift 2·Q2·MCQ·Easy–moderate
Open
Inert pair effect
It is noticed that $\ce{Pb^{2+}}$ is more stable than $\ce{Pb^{4+}}$ but $\ce{Sn^{2+}}$ is less stable than $\ce{Sn^{4+}}$ . Observe the following reactions
$\ce{PbO2 + Pb -> 2PbO}$ ; $\Delta_\mathrm{r}G^\circ$ (1)
$\ce{SnO2 + Sn -> 2SnO}$ ; $\Delta_\mathrm{r}G^\circ$ (2)
Identify the correct set from the following.
1. (1) $\Delta_\mathrm{r}G^\circ(1) > 0$ ; $\Delta_\mathrm{r}G^\circ(2) < 0$
2. (2) $\Delta_\mathrm{r}G^\circ(1) < 0$ ; $\Delta_\mathrm{r}G^\circ(2) < 0$
3. (3) $\Delta_\mathrm{r}G^\circ(1) < 0$ ; $\Delta_\mathrm{r}G^\circ(2) > 0$
4. (4) $\Delta_\mathrm{r}G^\circ(1) > 0$ ; $\Delta_\mathrm{r}G^\circ(2) > 0$
We corrected a printing error in the original paper
Source printed “ $\ce{Pb^{2+}}$ is more stable than $\ce{Pb^{2+}}$ ” (second charge wrong; the intended $\ce{Pb^{4+}}$ follows from the $\ce{Sn^{2+}}$ / $\ce{Sn^{4+}}$ comparison).
ChemistryJEE Main 24 Jan 2026, Shift 2·Q1·MCQ·Easy
Open
Anomalous properties of carbon
Choose the INCORRECT statement
1. (1)Among the isotopes of carbon, $^{13}$ C is a radioactive isotope.
2. (2)Carbon exhibits negative oxidation states along with $+4$ and $+2$ .
3. (3)Carbon cannot exceed its covalency more than four.
4. (4) $\ce{CO2}$ is the most acidic oxide among the dioxides of group 14 elements.
We corrected a printing error in the original paper
Option (4): source printed “the dioxides of group of 14 elements”.
ChemistryJEE Main 28 Jan 2026, Shift 2·Q17·MCQ·Easy–moderate
Open
Borax bead test
Consider the following reactions.
$\ce{Na2B4O7}\xrightarrow{\Delta}\ce{2X + Y}$
$\ce{CuSO4 + Y}\xrightarrow{\text{Non-Luminous flame}}\ce{Z + SO3}$
$\ce{2Z + 2X + Carbon}\xrightarrow{\text{Luminous flame}}\ce{2Q + Na2B4O7 + CO}$
The oxidation states of Cu in Z and Q, respectively are :
1. (1) $+2$ and $+2$
2. (2) $+2$ and $+1$
3. (3) $+1$ and $+2$
4. (4) $+1$ and $+1$
ChemistryJEE Main 4 Apr 2026, Shift 2·Q8·MCQ·Moderate
Open
Group 13 inert pair effect
The electronegativity of a group 13 element ‘E' is same as that of Ge (on Pauling scale and upto one decimal point). The CORRECT statements about $\ce{E^3+}$ are
- (A)It can act as a reducing agent.
- (B)It can act as an oxidizing agent.
- (C) $\ce{E^3+}$ is more stable than $\ce{E+}$ .
- (D)The standard electrode potential value for $\ce{E^3+}$ /E is positive.
Choose the correct answer from the options given below
1. (1)A and C Only
2. (2)B and C Only
3. (3)B and D Only
4. (4)A and D Only
ChemistryJEE Main 5 Apr 2026, Shift 2·Q9·MCQ·Easy–moderate
Open
Aluminium with alkali
Given below are two statements :
Statement-I : Aluminium upon reaction with NaOH forms $\ce{[Al(OH)6]^{3-}}$ ion.
Statement-II : The geometry of $\ce{ICl4-}$ , $\ce{ClO3-}$ and $\ce{IBr2-}$ is square planar, pyramidal and linear respectively.
In the light of the above statements, choose the correct answer from the options given below :
1. (1)Both Statement-I and Statement-II are true.
2. (2)Both Statement-I and Statement-II are false.
3. (3)Statement-I is true but Statement-II is false.
4. (4)Statement-I is false but Statement-II is true.
ChemistryJEE Main 6 Apr 2026, Shift 1·Q9·MCQ·Easy–moderate
Open
Group 13 electropositive character
Given below are two statements :
Statement-I : Aluminium is more electropositive than thallium as the standard electrode potential value of $E^\circ_{\mathrm{Al^{3+}/Al}}$ is negative and $E^\circ_{\mathrm{Tl^{3+}/Tl}}$ is positive.
Statement-II : The sum of first three ionization enthalpies of boron is very high when compared to that of aluminium. Due to this reason boron forms covalent compounds only and aluminium forms $\ce{Al^3+}$ ion.
In the light of the above statements, choose the correct answer from the options given below.
1. (1)Both Statement-I and Statement-II are true.
2. (2)Both Statement-I and Statement-II are false.
3. (3)Statement-I is true but Statement-II is false.
4. (4)Statement-I is false but Statement-II is true.